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Penn Championship tennis balls represent the standard by which all other tennis balls are measured with consistent feel and playability every time you step onto the court. Play Penn and see why its Americas #1 Selling Tennis Ball. Features: Extra Duty for use on hard courts Regular Duty for use on soft courts High Altitude for use on surfaces over 3500 feet of elevation Official Ball of USTA League Tennis The standard by which all other tennis balls are measured Controlled fiber release for consistent nap Natural rubber for consistent feel and reduced shock Interlocked wool fiber for longer wear Deep-elastic seams for reduced cracking